Journal
JOURNAL OF ENERGY STORAGE
Volume 37, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.102472
Keywords
Zn-Ni-Co oxide; Asymmetric supercapacitor; Electrochemical performance; Specific energy; Specific power
Categories
Funding
- National Natural Science Foundation of China
- Higher Education Commission of Pakistan [211891/SRGP/RD/HEC/2018]
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The 3D hierarchical nanostructure of Zn-Ni-Co oxide electrode material on Ni foam demonstrates excellent dimensional stability and structural features, high specific capacitance, and low contact resistance, making it a promising candidate for binder-free electrode materials. The asymmetric supercapacitor device, using activated carbon as the negative electrode and Zn-Ni-Co oxide as the positive electrode, shows high capacitance retention, specific power, and energy after 10,000 GCD cycles.
3D hierarchical nanostructure of Zn-Ni-Co oxide is grown on Ni foam (NF) using a hydrothermal reaction. Excellent dimensional stability and structural features, less contact resistance because of direct growth, and high electrical conductivity due to synergetic effects have made it a perfect candidate for binder-free electrode material. Zn-Ni-Co oxide show superior specific capacitance of 1837 F g(-1) at 1 A g(-1) with an excellent rate capability of 74.5% at 25 A g(-1). Up to 10,000 galvanic charge-discharge (GCD) cycles, a negligible loss of about 0.00132 F g(-1) in specific capacitance is observed after each GCD cycle in 3 M KOH electrolyte. The asymmetric supercapacitor (ASC) device is fabricated by activated carbon (AC) as negative and Zn-Ni-Co oxide as positive electrode material. Fabricated ASC device (Zn-Ni-Co oxide @NF//AC@NF) shows a specific capacitance of 123 F g(-1) at 1 A g(-1) with capacitance retention of 82% after 10,000 GCD cycles and potential window of 1.55 V. A maximum specific power of 6869 W kg(-1) at 20.99 Wh kg(-1) and specific energy of 41 Wh kg(-1) at 824.5 W kg(-1) is observed. The astounding electrochemical performance of the 3D hierarchical nanostructure of Zn-Ni-Co oxide electrode material indicates a promising candidate for efficient energy storage applications.
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